What Causes the Abnormal Noise in Motorcycle Brake Pumps?
2 Answers
The reason is that if the brake fluid is not replaced for a long time, it will deteriorate, and the moisture in the fluid will cause rust on the sub-pump, leading to friction and abnormal noise; the brake master pump returns slowly. Motorcycle Disc Brake Abnormal Noise: Poor contact of the brake pads. The wear between the brake disc and the brake pads is definitely not uniform because the material used for the brake pads is not pure metal blocks but a mixture of metal carbon ceramics, which is sintered into one under high temperature and pressure. The surface is smooth, so it makes the brake disc uneven, causing grooves. Motorcycle Disc Brake Structure: The brake is composed of the brake frame, brake components, and operating devices. Some brakes are also equipped with automatic adjustment devices for the clearance of brake components.
I've thought about the issue of brake pump noise many times, and the most common cause is air getting into the brake fluid. When you squeeze the brake lever, the air bubbles in the pump get compressed and make a 'creaking' sound. Another possibility is that the piston seals inside the pump have aged and cracked, causing metal parts to directly rub against the cylinder wall during piston movement, producing a sound like sandpaper grinding on metal. If your brake fluid hasn't been changed for over two years, the thickened fluid containing moisture can cause rust on the pump's inner walls, leading to scraping noises. Last time I encountered loose mounting bolts on the pump, causing the entire pump body to vibrate during braking, resulting in a very noticeable 'clattering' impact sound. Additionally, aging, swelling, or blocked hydraulic lines can cause fluctuating oil pressure, making the pump work with a labored, wheezing sound. I recommend first checking the fluid reservoir level, then squeezing the brake lever a few times to observe the noise pattern.
